Efficent lens operation for Data.Map et al.

Johan Tibell johan.tibell at gmail.com
Tue Jan 17 22:07:15 CET 2012

On Tue, Jan 17, 2012 at 11:22 AM,  <roconnor at theorem.ca> wrote:
> In fact, every other Map update operation should be derivable from the lens
> function.

We tried this an performance was terrible (although we used a zipper.)

-- Johan

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